Air-deflector for dynamo-electric machines.



F. W. YOUNG. AIR DEI'LEQTDR FOR DYNAMO ELECTRIC MACHINES.

APPLICATION IILED DEC. 6. 1907.

Patented Apr. 20, 1909.

Izwenlor,

UNITED STATES FREDERICK WM. YOUNG, OF EAST ORANGE, NEW JERSEY, ASSIGNOR COMPANY, OF AMPERE, NEW JERSEY, A CQRPORATION ENT. OFFICE.

TO CROCKER-WHEELER on NEW messy.

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Specification of Letters Patent.

P n e pr 2 4902- Application filed December 6, 1m. Serial No. 405,326.

To (Illa/27mm it may concern:

Be 1t known that I, FREDERICK lirLLniM Y UNG, a citizen of the United States of America, and a resident of East Grange,

Essex county, State of New Jersey, have invented certain new and useful Improve ments in Air-Deflectors for Dynamo-Electric Machines, of which the following is a specification.

In dynamo electric machines, particu larly of the general mechanical structure typified in large alternating current generators, having rotors with radially disposed poles, air currents are centrifugally induced in the spaces or passageways between the coils on the rotor poles, and these currents have been found to be adequate, if properly directed, for cooling the stator core and windings against which the currents are thrown.

But, unless special means are provided, it

, has been found that such currents take a more or less transverse direction in each passageway, which is the same in all the passageways, with the result that all the air currents flow, soon after the generator is started, over the stator windings in the same way at one side or the other of the generator and continue to flow at the same side as long as the generator is kept continuously running. erfect symmetry ofdesign does not prevent this phenomenon. In consequence, the

I stator windings at one side remain in comparatively dead air and are not properly cooled. The side to which all of the air currents become directed appears to be often a matter of chance unless there is air blowing against one side of the machine at the time 0 starting.

The ob ect of the'invention is to provide means 'for securing an equal distribution of such air currents on each side of the machine and over the stator core and coils.

A further object of the invention is. to sesure such distribution without increasing the air resistance of the machine.

In the accompanying sheet of drawings,

which forms a part ofthis application,'Fig-.

ure 1 is an elevation of an alternating current generator provided with air-deflectors in ac- Fig. 2 is a section through a portion of the rotor and stator on the line IIII of Fig. 1 drawn to a larger scale, the section through the rotor bein taken above the center so as to show sever of the rotor poles; v i

g The drawings illustrate an alternating current generator consisting of a stator frame S provided with stator windings A A on a laminated annular core C, and a rotor frame It provided with rotor windings F F on radially disposed poles P P spaced around the rotor frame and projecting away from the center. The larnmated core has ventilating spaces 0 c. The rotor windings are spaced more or less from each other, leaving transverse air passageways adjoining the stator and with one side of each more or less closed by the face of the stator core and the stator windings. Thesepassageways are blocked by deflectors D 1) preferably placed at one end of each passageway, half of the deflectors being located near or at the ends at one side and half being located at or near the ends at the other side of the rotor and preferably alternating in their location. These deflectors may be of metal or other suitable material, or as shown, the blades of the deflectors may be of fiber, riveted to supporting bars T T of iron or composition by which they are secured to the rotor frame.

When the generator is running the centriiugal action on the air in each passageway induces a flow radially outward against the face of the stator and through the vents in the stator core. These vents are insufiicient to conduct all of the air impelled outward,

blocked by the deflectors, the remainder of the air thus set in motion by centrifugal action is divided between the two sides of the machine. The directions of the flow of the air as described above are indicated by ar rows a a.

What I claim as. new and desire to secure by Letters Patent of the United States is- 1. In a dynamo-electric machine the combination with a rotor having radially disposed poles and windings thereon, of deflectors near one end of each of the passageways between the rotor windings whichblock the passageways, substantially as described.

2. In a dynamo-electric machine the combination with a rotor having. radially disposed poles and windings thereon, of deflectors near one end of each of the passageways between the rotor windings and which block the passageways without blocking the entrance at the opposite end of each of the passageways, substantially as described.

[3. In a dynamo-electric machine the comand the transverse spaces, being more or less bination with a rotor having radially disof the passageways at one side of the inaposed poles and windings thereon, of a dechine and the deflectors in other of the pasflector individual to one end of each of the sageways being near the ends of the passagepassageways between the rotor windings, ways at the other side of the machine, sub- 15 5 substantially as described. stantialiy as described.

4, In a dynamo-electric machine the eoni- Signed by me at East Orange, N. J;, this bination with a rotor h ving radially dis- 19th day of September, 1907. posed poles and windings thereon, of de- FREDERlCK WM. YOUNG. flectors which interrupt the passageways be- Witnesses: 10 tween the rotor windings, the deflectors for EDWARD HEITMANN,

part of the passageways being near the ends ANTHONY J. PonsKmivms. 

